added health watch client

1 files changed, 107 insertions, 0 deletions

diff --git a/health-watch.lua b/health-watch.lua
new file mode 100644
index 0000000..082c19d
--- /dev/null
+++ b/health-watch.lua
@@ -0,0 +1,107 @@
+--
+--  rhctl
+--
+--  Copyright (C) 2009-2014 Christian Pointner <equinox@helsinki.at>
+--
+--  This file is part of rhctl.
+--
+--  rhctl is free software: you can redistribute it and/or modify
+--  it under the terms of the GNU General Public License as published by
+--  the Free Software Foundation, either version 3 of the License, or
+--  any later version.
+--
+--  rhctl is distributed in the hope that it will be useful,
+--  but WITHOUT ANY WARRANTY; without even the implied warranty of
+--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+--  GNU General Public License for more details.
+--
+--  You should have received a copy of the GNU General Public License
+--  along with rhctl. If not, see <http://www.gnu.org/licenses/>.
+--
+
+package.path = package.path .. ';/usr/share/rhctl/?.lua'
+
+socket = require("socket")
+utils = require("utils")
+
+old_state = {}
+current_state = {}
+
+function state_changed()
+   for k,v in pairs(old_state) do
+       if v ~= current_state[k] then
+           return true
+       end
+   end
+   for k,v in pairs(current_state) do
+       if old_state[k] == nil then
+           return true
+       end
+   end
+   return false
+end
+
+function process_cmd(message)
+   local exps = { hs = "^Health: (%a+)$", mc = "^Master: (%a+)$", sc = "^Standby: (%a+)$", hbm = "^Hearbeat Master: (%a+, %a+)$", hbs = "^Hearbeat Standby: (%a+, %a+)$" }
+   for key, exp in pairs(exps) do
+      local state = string.match(message, exp)
+      if(state) then
+         if(key == 'hs') then
+            current_state = {}
+         end
+         current_state[key] = state
+      end
+   end
+
+   if(current_state['hbs'] ~= nil) then
+      if(state_changed()) then
+         body = "RHCTL Health Output:\n\n"
+         body = body .. "Health: " .. current_state['hs'] .. "\n"
+         body = body .. "Master: " .. current_state['mc'] .. "\n"
+         body = body .. "Standby: " .. current_state['sc'] .. "\n"
+         body = body .. "Master Hearbeat: " .. current_state['hbm'] .. "\n"
+         body = body .. "Standby Hearbeat: " .. current_state['hbs'] .. "\n"
+         utils.send_mail("logs@helsinki.at", "[RHCTL] health: " .. current_state['hs'], body)
+         old_state = current_state
+      end
+   end
+
+   return 0
+end
+
+function main_loop(opt)
+   log.printf(log.NOTICE, "main_loop started")
+   local sig = signal.init()
+   local cmdfd = cmd.init()
+
+   cmd.send_string("listen health");
+   cmd.send_string("health");
+
+   local return_value = 0
+   while return_value == 0 do
+      local readable, _, err = socket.select({ sig , cmdfd }, nil)
+      if(err) then
+         log.printf(log.ERROR, "select returned with error: %s", err)
+         return_value = -1
+      else
+         for _, input in ipairs(readable) do
+            if(input == sig) then
+               return_value = signal.handle()
+               if(return_value == 1) then break end
+            else
+               if(input == cmdfd) then
+                  return_value = cmd.recv_data(process_cmd)
+                  if(return_value ~= 0) then break end
+               else
+                  log.printf(log.ERROR, "select returned invalid handle??")
+                  return_value = -1
+                  break;
+               end
+            end
+         end
+      end
+   end
+
+   signal.stop()
+   return return_value
+end